From 8cd46542efbe1e66ec5e85ab5eaad5001923e101 Mon Sep 17 00:00:00 2001
From: Tait Hoyem <44244401+TTWNO@users.noreply.github.com>
Date: Fri, 5 Apr 2019 22:16:23 +0000
Subject: [PATCH] Fix board type. Add pos_to_pair, pair_to_pos functions

---
 src/functions.cpp | 35 +++++++++++++++++++++++++++++------
 src/functions.h   |  8 ++++++--
 2 files changed, 35 insertions(+), 8 deletions(-)

diff --git a/src/functions.cpp b/src/functions.cpp
index 8c1e641..154efbb 100644
--- a/src/functions.cpp
+++ b/src/functions.cpp
@@ -1,23 +1,46 @@
 #include "functions.h"
+#include <stdexcept>
+#include <cmath>
+#include <iostream>
+#include <stdio.h>
 
 // TODO implement functions.h functions.
 // NOTE tests will NOT run unless you implement these functions.
 
 std::pair<int, int> pos_to_pair(Position pn){
-	// TODO replace with real code. Just implementing for running the tests.
-	return std::make_pair(-1, -1);
+	int x,y = 0;
+	for (x = pn; x >= 8; x = x-8){
+		++y;
+	}
+	return std::make_pair(x, std::abs(y-7));
 }
 
+// TODO find way to make function arbitary to board size as to allow wide game chess variants. Do much later. Not important now.
 Position pair_to_pos(std::pair<int, int> pr){
-	return Position::A1;
+	if (pr.first > 7 || pr.first < 0
+	||  pr.second > 7 || pr.second < 0) {
+		throw std::invalid_argument("Cannot use any pairs with values > 7 or < 0.");
+	}
+	int int_val = std::abs(pr.second - 7)*8 + pr.first;
+	if (int_val > 0 && int_val < 64) {
+		return static_cast<Position>(int_val);
+	} else {
+		throw std::invalid_argument("Something went terribly wrong. x and y < 8 && x and y > 0 but abs(y-7)*8 + x < 0 or >= 64");
+	}
 }
-
-std::vector<Position> get_possible_movers(Position pn, std::vector<PieceType> board){
+std::vector<Position> get_possible_movers(Position pn, std::array<PieceType, 64> board){
 	std::vector<Position> pns = {Position::A1};
 	return pns;
 }
 
-std::vector<Position> get_possible_moves(Position pn, std::vector<PieceType> board){
+std::vector<Position> get_possible_moves(Position pn, std::array<PieceType, 64> board){
 	std::vector<Position> pns = {Position::A1};
 	return pns;
 }
+
+std::array<PieceType, 64> dumb_move(Position from, Position to, std::array<PieceType, 64> board){
+	PieceType piece = board[from];
+	board[to] = piece;
+	board[from] = PieceType::NONE;
+	return board;
+}
diff --git a/src/functions.h b/src/functions.h
index 337fe18..16b4744 100644
--- a/src/functions.h
+++ b/src/functions.h
@@ -12,8 +12,12 @@ std::pair<int, int> pos_to_pair(Position pn);
 // Get all positions of pieces which can move to this square
 // This may require helper functions for each individual peice.
 // TODO rename to something less stupid.
-std::vector<Position> get_possible_movers(Position pn, std::vector<PieceType> pt);
+std::vector<Position> get_possible_movers(Position pn, std::array<PieceType, 64> pt);
 
 // Get all possible moved for piece in Position pn.
 // This may require helper functions for each individual piece.
-std::vector<Position> get_possible_moves(Position pn, std::vector<PieceType> pt);
+std::vector<Position> get_possible_moves(Position pn, std::array<PieceType, 64> pt);
+
+// Dumb function to do board moves.
+// Does NOT check for valid moves. Only moves PieceType of Pos1 to Pos2, then replaces Pos1 with Piecetype::NONE
+std::array<PieceType, 64> dumb_move(Position from, Position to, std::array<PieceType, 64> board);